Drivetrain Controls - Service 4WD Lamp ON/DTC C1078
NUMBER: 21-007-11GROUP: Transmission and Transfer Case
DATE: June 24, 2011
HELP USING THE wiTECH DIAGNOSTIC APPLICATION FOR FLASHING AN ECU IS AVAILABLE BY SELECTING "HELP" THEN "HELP CONTENTS" AT THE TOP OF THE wiTECH DIAGNOSTIC APPLICATION WINDOW.
THE wiTECH SOFTWARE LEVEL MUST BE AT RELEASE 12.01 OR HIGHER TO PERFORM THIS PROCEDURE.
SUBJECT:
Flash: Service 4WD Light Illuminated With C1078 Stored
OVERVIEW:
This bulletin involves flash reprogramming the Drive Train Control Module (DTCM) with new software.
MODELS:
2011 (LD) Charger
2011 (LX) 300
NOTE:
This Service Bulletin applies to vehicles equipped with All Wheel Drive (sales code DKB).
SYMPTOM/CONDITION:
Some customers may get a "Service 4WD" light in the Cabin Compartment Node (CCN).
Upon further investigation the Technician may find that C1078 - Tire Revolutions Range Performance diagnostic trouble code (DTC) is set in the DTCM.
This condition may occur when driving on a slippery road and the AWD system is monitoring for slipping wheels. Under these conditions the AWD system may incorrectly determining that one wheel is spinning too much. When the AWD system detects this, it shuts down the AWD capability for the remainder of the drive cycle. The system is overly sensitive to wheel slip and may set this DTC when no issue is present.
The system was re-calibrated to allow more wheel slip before setting this DTC. This condition is not monitored when operating in 2WD mode. Updating the DTCM software will correct the conditions above.
DIAGNOSIS:
Using a Scan Tool (wiTECH(TM)) with the appropriate Diagnostic Procedures available in TechCONNECT, verify no DTC's are set. If DTC's are present other then the one listed above record them on the repair order and repair as necessary before proceeding further with this bulletin.
If the customer describes the symptom, perform the Repair Procedure.
PARTS REQUIRED:
REPAIR PROCEDURE:
NOTE:
Install a battery charger to ensure battery voltage does not drop below 13.2 volts. Do not allow the charging voltage to climb above 13.5 volts during the flash process.
NOTE:
If this flash process is interrupted/aborted, the flash should be restarted.
1. Reprogram the DTCM with the latest software. Help using the wiTECH diagnostic application for flashing an ECU is available by selecting "help then "help contents" at the top of the wiTECH diagnostic application window. After DTCM reprogramming, the following must be performed:
a. Clear any DTC's that may have been set in other modules due to reprogramming. The wiTECH application will automatically present all DTCs after the flash and allow the tech to clear them.
2. Type the necessary information on the "Authorized Modification Label" and attach it near the VECI label.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE CODE:
Disclaimer:
This bulletin is supplied as technical information only and is not an authorization for repair.